- 01 Jul, 2020 2 commits
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Sergei Shtylyov authored
Add the memory driver for Renesas RPC-IF which registers either SPI or HyperFLash device depending on the contents of the device tree subnode. It also provides the absract "back end" device APIs that can be used by the "front end" SPI/MTD drivers to talk to the real hardware. Based on the original patch by Mason Yang <masonccyang@mxic.com.tw>. Signed-off-by:
Sergei Shtylyov <sergei.shtylyov@cogentembedded.com> Link: https://lore.kernel.org/r/9a3606ec-d4d0-c63a-4fb6-631ab38e621c@cogentembedded.comSigned-off-by:
Mark Brown <broonie@kernel.org>
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Sergei Shtylyov authored
Renesas Reduced Pin Count Interface (RPC-IF) allows a SPI flash or HyperFlash connected to the SoC to be accessed via the external address space read mode or the manual mode. Document the device tree bindings for the Renesas RPC-IF found in the R-Car gen3 SoCs. Based on the original patch by Mason Yang <masonccyang@mxic.com.tw>. Signed-off-by:
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- 29 Jun, 2020 2 commits
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Linus Walleij authored
The OMAP2 MCSPI has some kind of half-baked GPIO CS support: it includes code like this: if (gpio_is_valid(spi->cs_gpio)) { ret = gpio_request(spi->cs_gpio, dev_name(&spi->dev)); (...) But it doesn't parse the "cs-gpios" attribute in the device tree to count the number of GPIOs or pick out the GPIO numbers and put these in the SPI master's .cs_gpios property. We complete the implementation of supporting CS GPIOs from the device tree and switch it over to use the SPI core for this. Signed-off-by:Linus Walleij <linus.walleij@linaro.org> Acked-by:
Tony Lindgren <tony@atomide.com> Link: https://lore.kernel.org/r/20200625231257.280615-1-linus.walleij@linaro.orgSigned-off-by:
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Douglas Anderson authored
Setting the chip select on the Qualcomm geni SPI controller isn't exactly cheap. Let's cache the current setting and avoid setting the chip select if it's already right. Using "flashrom" to read or write the EC firmware on a Chromebook shows roughly a 25% reduction in interrupts and a 15% speedup. Signed-off-by:
Douglas Anderson <dianders@chromium.org> Link: https://lore.kernel.org/r/20200626151946.1.I06134fd669bf91fd387dc6ecfe21d44c202bd412@changeidSigned-off-by:
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- 24 Jun, 2020 2 commits
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Xu Yilun authored
Add the MODULE_DEVICE_TABLE macro for the platform_device_id table to allow proper creation of modalias strings and fix autoloading module for this driver. Signed-off-by:
Xu Yilun <yilun.xu@intel.com> Signed-off-by:
Russ Weight <russell.h.weight@intel.com> Link: https://lore.kernel.org/r/1592962286-25752-3-git-send-email-yilun.xu@intel.comSigned-off-by:
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Xu Yilun authored
The driver is expected to support device ID "spi_altera" for MMIO accessed devices, device ID "subdev_spi_altera" for indirect accessed devices. But the platform bus will not try driver name match anymore if the platform driver has an id_table. So the "spi_altera" should also be added to id_table. Signed-off-by:
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- 23 Jun, 2020 2 commits
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Robin Gong authored
Add fallback pio feature in case dma transfer failed before start. Besides, another whole pio transfer including setup_transfer will be issued by spi core, no need to restore jobs like commit bcd8e776 ("spi: imx: fallback to PIO if dma setup failure"). Signed-off-by:
Robin Gong <yibin.gong@nxp.com> Link: https://lore.kernel.org/r/1592347329-28363-3-git-send-email-yibin.gong@nxp.comSigned-off-by:
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Robin Gong authored
Add fallback to pio mode in case dma transfer failed with error status SPI_TRANS_FAIL_NO_START. If spi client driver want to enable this feature please set xfer->error in the proper place such as dmaengine_prep_slave_sg() failure detect(but no any data put into spi bus yet). Besides, add master->fallback checking in its can_dma() so that spi core could switch to pio next time. Please refer to spi-imx.c. Signed-off-by:
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- 22 Jun, 2020 3 commits
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Mark Brown authored
To follow onto Doug's latest spi geni series[1] this simplifies and reduces the code a little more. [1] https://lore.kernel.org/r/20200618150626.237027-1-dianders@chromium.org Stephen Boyd (2): spi: spi-geni-qcom: Simplify setup_fifo_xfer() spi: spi-geni-qcom: Don't set {tx,rx}_rem_bytes unnecessarily drivers/spi/spi-geni-qcom.c | 55 +++++++++++++++++-------------------- 1 file changed, 25 insertions(+), 30 deletions(-) base-commit: 7ba9bdcb -- Sent by a computer, using git, on the internet
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Stephen Boyd authored
We only need to test for these counters being non-zero when we see the end of a transfer. If we're doing a CS change then they will already be zero. This implies that we don't need to set these to 0 if we're cancelling an in flight transfer too, because we only care to test these counters when the 'DONE' bit is set in the hardware and we've set them to non-zero for a transfer. This is a non-functional change, just cleanup to consolidate code. Signed-off-by:
Stephen Boyd <swboyd@chromium.org> Reviewed-by:
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Stephen Boyd authored
The definition of SPI_FULL_DUPLEX (3) is really SPI_TX_ONLY (1) ORed with SPI_RX_ONLY (2). Let's drop the define and simplify the code here a bit by collapsing the setting of 'm_cmd' into conditions that are the same. This is a non-functional change, just cleanup to consolidate code. Signed-off-by:
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- 19 Jun, 2020 20 commits
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Stephen Boyd authored
The definition of SPI_FULL_DUPLEX (3) is really SPI_TX_ONLY (1) ORed with SPI_RX_ONLY (2). Let's drop the define and simplify the code here a bit by collapsing the setting of 'm_cmd' into conditions that are the same. This is a non-functional change, just cleanup to consolidate code. Signed-off-by:
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Mark Brown authored
Merge series "mtd: spi-nor: Move cadence-qaudspi to spi-mem framework" from Vignesh Raghavendra <vigneshr@ti.com>: This series is a subset of "[PATCH v12 0/4] spi: cadence-quadspi: Add support for the Cadence QSPI controller" by Ramuthevar,Vadivel MuruganX <vadivel.muruganx.ramuthevar@linux.intel.com> that intended to move cadence-quadspi driver to spi-mem framework Those patches were trying to accomplish too many things in a single set of patches and need to split into smaller patches. This is reduced version of above series. Changes that are intended to make migration easy are split into separate patches. Patches 1 to 3 drop features that cannot be supported under spi-mem at the moment (backward compatibility is maintained). Patch 4-5 are trivial cleanups. Patch 6 does the actual conversion to spi-mem and patch 7 moves the driver to drivers/spi folder. I have tested both INDAC mode (used by non TI platforms like Altera SoCFPGA) and DAC mode (used by TI platforms) on TI EVMs. Patches to move move bindings over to "Documentation/devicetree/bindings/spi/" directory and also conversion of bindig doc to YAML will be posted separately. Support for Intel platform would follow that. Resend v3: Rebased onto v5.7-c1 v3: Split handling of probe deferral into separate patch (out of 5/6) Split dropping of redundant WREN to separate patch (out of 5/6) Fix a possible memleak due to lack of spi_master_put() Parse all SPI slave nodes in cqspi_setup_flash() Address misc comments from Tudor on v2 Rebase onto latest spi-nor/next v2: Rework patch 1/6 to keep "cdns,is-decoded-cs" property supported. Ramuthevar Vadivel Murugan (2): mtd: spi-nor: Convert cadence-quadspi to use spi-mem framework spi: Move cadence-quadspi driver to drivers/spi/ Vignesh Raghavendra (6): mtd: spi-nor: cadence-quadspi: Make driver independent of flash geometry mtd: spi-nor: cadence-quadspi: Provide a way to disable DAC mode mtd: spi-nor: cadence-quadspi: Don't initialize rx_dma_complete on failure mtd: spi-nor: cadence-quadspi: Fix error path on failure to acquire reset lines mtd: spi-nor: cadence-quadspi: Handle probe deferral while requesting DMA channel mtd: spi-nor: cadence-quadspi: Drop redundant WREN in erase path drivers/mtd/spi-nor/controllers/Kconfig | 11 - drivers/mtd/spi-nor/controllers/Makefile | 1 - drivers/spi/Kconfig | 11 + drivers/spi/Makefile | 1 + .../spi-cadence-quadspi.c} | 541 +++++++----------- 5 files changed, 222 insertions(+), 343 deletions(-) rename drivers/{mtd/spi-nor/controllers/cadence-quadspi.c => spi/spi-cadence-quadspi.c} (74%) base-commit: b3a9e3b9 -- 2.26.2 ______________________________________________________ Linux MTD discussion mailing list http://lists.infradead.org/mailman/listinfo/linux-mtd/ -
Ramuthevar Vadivel Murugan authored
Now that cadence-quadspi has been converted to use spi-mem framework, move it under drivers/spi/ Update license header to match SPI subsystem style Signed-off-by:
Ramuthevar Vadivel Murugan <vadivel.muruganx.ramuthevar@linux.intel.com> Signed-off-by:
Vignesh Raghavendra <vigneshr@ti.com> Reviewed-by:
Tudor Ambarus <tudor.ambarus@microchip.com> Acked-by:
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Ramuthevar Vadivel Murugan authored
Move cadence-quadspi driver to use spi-mem framework. This is required to make the driver support for SPI NAND flashes in future. Driver is feature compliant with existing SPI NOR version. Signed-off-by:
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Vignesh Raghavendra authored
Drop redundant WREN command in cqspi_erase() as SPI NOR core takes care of sending WREN command before sending erase command. Signed-off-by:
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Vignesh Raghavendra authored
dma_request_chan_by_mask() can throw EPROBE_DEFER if DMA provider is not yet probed. Currently driver just falls back to using PIO mode (which is less efficient) in this case. Instead return probe deferral error as is so that driver will be re probed once DMA provider is available. Signed-off-by:
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Vignesh Raghavendra authored
Make sure to undo the prior changes done by the driver when exiting due to failure to acquire reset lines. Signed-off-by:
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Vignesh Raghavendra authored
If driver fails to acquire DMA channel then don't initialize rx_dma_complete struct as it won't be used. Signed-off-by:
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Vignesh Raghavendra authored
Currently direct access mode is used on platforms that have AHB window (memory mapped window) larger than flash size. This feature is limited to TI platforms as non TI platforms have < 1MB of AHB window. Therefore introduce a driver quirk to disable DAC mode and set it for non TI compatibles. This is in preparation to move to spi-mem framework where flash geometry cannot be known. Signed-off-by:
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Vignesh Raghavendra authored
Drop configuration of Flash size, erase size and page size configuration. Flash size is needed only if using AHB decoder (BIT 23 of CONFIG_REG) which is not used by the driver. Erase size and page size are needed if IP is configured to send WREN automatically. But since SPI NOR layer takes care of sending WREN, there is no need to configure these fields either. Therefore drop these in preparation to move the driver to spi-mem framework where flash geometry is not visible to controller driver. Signed-off-by:
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Mark Brown authored
Updated the regmap & indirect access support for spi-altera. Patch #1 is an 1:1 replacement of of readl/writel with regmap_read/write Patch #2 introduced a new platform_device_id to support indirect access as a sub device. Patch #3 is a minor fix. Main changes from v1: - Split the regmap supporting patch to 2 patches. - Add a new platform_device_id to support indirect access. - Removed the v1 patch "move driver name string to header file". Now we use driver name string directly. - Add Yilun's Signed-off-by for Patch #3. - Add Tom's Reviewed-by. Matthew Gerlach (1): spi: altera: fix size mismatch on 64 bit processors Xu Yilun (2): spi: altera: use regmap-mmio instead of direct mmio register access spi: altera: support indirect access to the registers drivers/spi/Kconfig | 1 + drivers/spi/spi-altera.c | 127 +++++++++++++++++++++++++++++++++++++++-------- 2 files changed, 107 insertions(+), 21 deletions(-) -- 2.7.4 -
Mark Brown authored
Merge series "spi: spi-geni-qcom: Fixes / perf improvements" from Douglas Anderson <dianders@chromium.org>: This patch series is a new version of the previous patch posted: [PATCH v2] spi: spi-geni-qcom: Speculative fix of "nobody cared" about interrupt https://lore.kernel.org/r/20200317133653.v2.1.I752ebdcfd5e8bf0de06d66e767b8974932b3620e@changeid At this point I've done enough tracing to know that there was a real race in the old code (not just weakly ordered memory problems) and that should be fixed with the locking patches. While looking at this driver, I also noticed we weren't properly noting error interrupts and also weren't actually using our FIFO effectively, so I fixed those. The last patch in the series addresses review feedback about dislike for the "cur_mcmd" state variable. It also could possibly make "abort" work ever-so-slightly more reliably. Changes in v4: - Drop 'controller' in comment. - Use Stephen's diagram to explain the race better. Changes in v3: - ("spi: spi-geni-qcom: No need for irqsave variant...") new for v3 - Split out some lock cleanup to previous patch. - Don't need to read IRQ status register inside spinlock. - Don't check for state CMD_NONE; later patch is removing state var. - Don't hold the lock for all of setup_fifo_xfer(). - Comment about why it's safe to Ack interrupts at the end. - Subject/desc changed since race is definitely there. - ("spi: spi-geni-qcom: Check for error IRQs") new in v3. - ("spi: spi-geni-qcom: Actually use our FIFO") new in v3. - ("spi: spi-geni-qcom: Don't keep a local state variable") new in v3. Changes in v2: - Detect true spurious interrupt. - Still return IRQ_NONE for state machine mismatch, but print warn. Douglas Anderson (5): spi: spi-geni-qcom: No need for irqsave variant of spinlock calls spi: spi-geni-qcom: Mo' betta locking spi: spi-geni-qcom: Check for error IRQs spi: spi-geni-qcom: Actually use our FIFO spi: spi-geni-qcom: Don't keep a local state variable drivers/spi/spi-geni-qcom.c | 120 ++++++++++++++++++++++++------------ 1 file changed, 81 insertions(+), 39 deletions(-) -- 2.27.0.290.gba653c62da-goog
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Andy Shevchenko authored
No need to redefine already existing definition. So, replace custom by generic one. Signed-off-by:
Andy Shevchenko <andriy.shevchenko@linux.intel.com> Link: https://lore.kernel.org/r/20200618170144.57433-1-andriy.shevchenko@linux.intel.comSigned-off-by:
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Douglas Anderson authored
The variable "cur_mcmd" kept track of our current state (idle, xfer, cs, cancel). We don't really need it, so get rid of it. Instead: * Use separate condition variables for "chip select done", "cancel done", and "abort done". This is important so that if a "done" comes through (perhaps some previous interrupt finally came through) it can't confuse the cancel/abort function. * Use the "done" interrupt only for when a chip select or transfer is done and we can tell the difference by looking at whether "cur_xfer" is NULL. This is mostly a no-op change. However, it is possible it could fix an issue where a super delayed interrupt for a cancel command could have confused our waiting for an abort command. Signed-off-by:
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Douglas Anderson authored
The geni hardware has a FIFO that can hold up to 64 bytes (it has 16 entries that can hold 4 bytes each), at least on the two SoCs I tested (sdm845 and sc7180). We configured our RX Watermark to 0, which basically meant we got an interrupt as soon as the first 4 bytes showed up in the FIFO. Tracing the IRQ handler showed that we often only read 4 or 8 bytes per IRQ handler. I tried setting the RX Watermark to "fifo size - 2" but that just got me a bunch of overrun errors reported. Setting it to "fifo size - 3" seemed to work great, though. This made me worried that we'd start getting overruns if we had long interrupt latency, but that doesn't appear to be the case and delays inserted in the IRQ handler while using "fifo size - 3" didn't cause any errors. Presumably there is some interaction with the poorly-documented RFR (ready for receive) level means that "fifo size - 3" is the max. We are the SPI master, so it makes sense that there would be no problems with overruns, the master should just stop clocking. Despite "fifo size - 3" working, I chose "fifo size / 2" (8 entries = 32 bytes) which gives us a little extra time to get to the interrupt handler and should reduce dead time on the SPI wires. With this setting, I often saw the IRQ handler handle 40 bytes but sometimes up to 56 if we had bad interrupt latency. Testing by running "flashrom -p ec -r" on a Chromebook saw interrupts from the SPI driver cut roughly in half. Time was roughly the same. Fixes: 561de45f ("spi: spi-geni-qcom: Add SPI driver support for GENI based QUP") Signed-off-by:
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Douglas Anderson authored
>From reading the #defines it seems like we should shout if we ever see one of these error bits. Let's do so. This doesn't do anything functional except print a yell in the log if the error bits are seen. Signed-off-by:
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Douglas Anderson authored
If you added a bit of a delay (like a trace_printk) into the ISR for the spi-geni-qcom driver, you would suddenly start seeing some errors spit out. The problem was that, though the ISR itself held a lock, other parts of the driver didn't always grab the lock. One example race was this: CPU0 CPU1 ---- ---- spi_geni_set_cs() mas->cur_mcmd = CMD_CS; geni_se_setup_m_cmd(...) wait_for_completion_timeout(&xfer_done); <INTERRUPT> geni_spi_isr() complete(&xfer_done); <wakeup> pm_runtime_put(mas->dev); ... // back to SPI core spi_geni_transfer_one() setup_fifo_xfer() mas->cur_mcmd = CMD_XFER; mas->cur_cmd = CMD_NONE; // bad! return IRQ_HANDLED; Let's fix this. Before we start messing with hardware, we'll grab the lock to make sure that the IRQ handler from some previous command has really finished. We don't need to hold the lock unless we're in a state where more interrupts can come in, but we at least need to make sure the previous IRQ is done. This lock is used exclusively to prevent the IRQ handler and non-IRQ from stomping on each other. The SPI core handles all other mutual exclusion. As part of this, we change the way that the IRQ handler detects spurious interrupts. Previously we checked for our state variable being set to IRQ_NONE, but that was done outside the spinlock. We could move it into the spinlock, but instead let's just change it to look for the lack of any IRQ status bits being set. This can be done outside the lock--the hardware certainly isn't grabbing or looking at the spinlock when it updates its status register. It's possible that this will fix real (but very rare) errors seen in the field that look like: irq ...: nobody cared (try booting with the "irqpoll" option) NOTE: an alternate strategy considered here was to always make the complete() / spi_finalize_current_transfer() the very last thing in our IRQ handler. With such a change you could consider that we could be "lockless". In that case, though, we'd have to be very careful w/ memory barriers so we made sure we didn't have any bugs with weakly ordered memory. Using spinlocks makes the driver much easier to understand. Fixes: 561de45f ("spi: spi-geni-qcom: Add SPI driver support for GENI based QUP") Signed-off-by: -
Matthew Gerlach authored
The spi-altera driver was originally written with a 32 bit processor, where sizeof(unsigned long) is 4. On a 64 bit processor sizeof(unsigned long) is 8. Change the structure member to u32 to match the actual size of the control register. Signed-off-by:
Matthew Gerlach <matthew.gerlach@linux.intel.com> Signed-off-by:
Tom Rix <trix@redhat.com> Link: https://lore.kernel.org/r/1592531021-11412-4-git-send-email-yilun.xu@intel.comSigned-off-by:
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Xu Yilun authored
This patch adds support for indirect access to the registers via parent regmap. The use case is, the spi master is a sub device of a Multifunction device, which is connected to host by some indirect bus. To support this device type, a new platform_device_id is introduced, and the driver tries to get parent regmap for register accessing like many MFD sub device drivers do. Signed-off-by:
Wu Hao <hao.wu@intel.com> Signed-off-by:
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Xu Yilun authored
This patch adds support for regmap. It makes preparation for supporting different ways to access the registers. Signed-off-by:
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- 18 Jun, 2020 1 commit
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Douglas Anderson authored
The driver locks its locks in two places. In the first usage of the lock the function doing the locking already has a sleeping call and thus we know we can't be called from interrupt context. That means we can use the "spin_lock_irq" variant of the function. In the second usage of the lock the function is the interrupt handler and we know interrupt handlers are called with interrupts disabled. That means we can use the "spin_lock" variant of the function. This patch is expected to be a no-op and is just a cleanup / slight optimization. Signed-off-by:
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- 17 Jun, 2020 2 commits
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Álvaro Fernández Rojas authored
bcm63xx arch resets the HSSPI controller at early boot. However, bmips arch needs to perform a reset when probing the driver. Signed-off-by:
Álvaro Fernández Rojas <noltari@gmail.com> Reviewed-by:
Philipp Zabel <p.zabel@pengutronix.de> Reviewed-by:
Florian Fainelli <f.fainelli@gmail.com> Link: https://lore.kernel.org/r/20200616173235.3473149-3-noltari@gmail.comSigned-off-by:
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Álvaro Fernández Rojas authored
bcm63xx arch resets the SPI controller at early boot. However, bmips arch needs to perform a reset when probing the driver. Signed-off-by:
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- 15 Jun, 2020 6 commits
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Mark Brown authored
Merge series "Add MSIOF support for R8A7742 SOC" from Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>: Hi All, This patch series adds support for MSIOF on R8A7742 SOC. Cheers, Prabhakar Lad Prabhakar (2): dt-bindings: spi: renesas,sh-msiof: Add r8a7742 support ARM: dts: r8a7742: Add MSIOF[0123] support .../devicetree/bindings/spi/renesas,sh-msiof.yaml | 1 + arch/arm/boot/dts/r8a7742.dtsi | 64 ++++++++++++++++++++++ 2 files changed, 65 insertions(+) -- 2.7.4
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Mark Brown authored
BCM63xx SPI and HSSPI controller are present on several BMIPS SoCs (BCM6318, BCM6328, BCM6358, BCM6362, BCM6368 and BCM63268). v2: use devm_reset_control_get_exclusive Álvaro Fernández Rojas (4): spi: bcm63xx-spi: add reset support spi: bcm63xx-spi: allow building for BMIPS spi: bcm63xx-hsspi: add reset support spi: bcm63xx-hsspi: allow building for BMIPS drivers/spi/Kconfig | 4 ++-- drivers/spi/spi-bcm63xx-hsspi.c | 17 +++++++++++++++++ drivers/spi/spi-bcm63xx.c | 17 +++++++++++++++++ 3 files changed, 36 insertions(+), 2 deletions(-) -- 2.27.0 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
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Mark Brown authored
Merge series "Add more configuration and regmap support for spi-altera" from Xu Yilun <yilun.xu@intel.com>: This patchset adds platform_data for spi-altera, to enable more IP configurations, and creating specific spi client devices. It also adds regmap support, to enable the indirect access to this IP. We have a PCIE based FPGA platform which integrates this IP to communicate with a BMC chip (Intel MAX10) over SPI. The IP is configured as 32bit data width. There is also an indirect access interface in FPGA for host to access the registers of this IP. This patchset enables this use case. Matthew Gerlach (1): spi: altera: fix size mismatch on 64 bit processors Xu Yilun (5): spi: altera: add 32bit data width transfer support. spi: altera: add SPI core parameters support via platform data. spi: altera: add platform data for slave information. spi: altera: use regmap instead of direct mmio register access spi: altera: move driver name string to header file drivers/spi/Kconfig | 1 + drivers/spi/spi-altera.c | 161 +++++++++++++++++++++++++++++++++++++-------- include/linux/spi/altera.h | 37 +++++++++++ 3 files changed, 171 insertions(+), 28 deletions(-) create mode 100644 include/linux/spi/altera.h -- 2.7.4
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Tim Harvey authored
The OcteonTX (TX1/ThunderX) SPI controller does not support full duplex transactions. Set the appropriate flag such that the spi core will return -EINVAL on such transactions requested by chip drivers. This is an RFC as I need someone from Marvell/Cavium to confirm if this driver is used for other silicon that does support full duplex transfers (in which case we will need to identify that we are running on the ThunderX arch before setting the flag). Signed-off-by:
Tim Harvey <tharvey@gateworks.com> Cc: Robert Richter <rrichter@marvell.com> Link: https://lore.kernel.org/r/1590680799-5640-1-git-send-email-tharvey@gateworks.comSigned-off-by:
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Sergei Shtylyov authored
Add the SPI driver for the Renesas RPC-IF. It's the "front end" driver using the "back end" APIs in the main driver to talk to the real hardware. We only implement the 'spi-mem' interface -- there's no need to implement the usual SPI driver methods... Based on the original patch by Mason Yang <masonccyang@mxic.com.tw>. Signed-off-by:
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Álvaro Fernández Rojas authored
bcm63xx-hsspi controller is present on several BMIPS SoCs (BCM6318, BCM6328, BCM6362 and BCM63268). Signed-off-by:
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